Virtual Lab - Rates of Reaction

Virtual Lab - Rate of Chemical Reactions

Before we begin- some instructions:

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Virtual Lab - Rate of Chemical Reactions

Click the pencil here to draw on the slide. You'll need this to record your data. When you unclick it- the drawings disappear. They reappear when you click it again. Try it out!

The slides should guide you through, but if you get lost- this button will always bring you back to the main lab where you can navigate to where you need to be.

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Virtual Lab - Rate of Chemical Reactions

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hi

Welcome to the lab!

Check the bulletin board to see what we're working on today.

Today's Agenda:

Lab investigation about rates of chemical reactions

Check your lab notebook for the materials and procedure

back to the lab

GO

What is Alka Selzter?

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What is Surface Area?

What is surface area?

It is a measurement of how much surface is exposed on an object.

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What is surface area?

If you break an object into smaller pieces, you increase the surface area. This is because there are more pieces of the same amount of substance, therefore more surface area has been created.

What is Alka Selzter?

Alka seltzer is an antacid that mainly consists of baking soda, citric acid, and asprin. People take it for heartburn or upset stomach. The baking soda & citric acid react together when mixed with water. The asprin is a pain reliever.

This is the chemistry of the reaction

Science Lab Notebook

Pre-Lab Thoughts

In this notebook you will find your lab materials and procedure. You can record your data here intially but you will also need to write it in your lab report. You will also record your observations, data analysis & conclusion in your lab report. Answer the pre-lab questions and then to perform the experiment, go back to the main lab and find the area with your materials. (You can navigate to the different trials in the "Record Data" section)

Lab Materials

Lab Procedure

Experiment / Observations

Record Data

Data Analysis

Conclusion

Answer/record this on your lab report to be handed in!

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Today's Lab:

Pre Lab Questions to be answered:

Today we are going to investigate what variables influence the rate of a chemical reaction. The chemical reaction we will observe is dissolving alka-seltzer tablets in water. ** Answer these pre-lab questions on your lab report before you continue onto the experiment.

1. What do you know about alka selzter? Do you know what it is or what it does in water? Write down your prior knowledge without researching.

2. Do you have any ideas about what could influence the rate of a chemical reaction? (For instance- make it go faster or slower?)

3. In this experiement, we will be doing multiple trials of the same thing. (We will be testing the same thing a few times). Why do you think this is important?

* To learn more about what alka seltzer is- go back to the lab and do research on the computer

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Today's Lab:

Materials

Today we are going to investigate what variables influence the rate of a chemical reaction. The chemical reaction we will observe is the dissolving of alka-seltzer tablets in water. We will record our data, study our findings, and come to a conclusion about what can influence the rate of a chemical reaction.

9 Alka Seltzer tablets

Water

Beakers

Timer

Gather Materials

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Today's Lab:

Materials

Today we are going to investigate what variables influence the rate of a chemical reaction. The chemical reaction we will observe is the dissolving of alka-seltzer tablets in water. We will record our data, study our findings, and come to a conclusion about what can influence the rate of a chemical reaction.

9 Alka Seltzer tablets

Water

Beakers

Timer

Gather Materials

Back to Index

Check off the materials and go back

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Procedure

Today's Lab:

Investigation Question: How does surface area affect the rate of a chemical reaction? The variable we will be focusing on is surface area. Check the lab computer for some more information on surface area.

Three conditions of substance: Whole, Broken (pieces), Crushed (powder)

For each condition, perform 3 trials of the following: 1. Drop substance into container. 2. Add 150 ml of room temperature water. 3. Observe until tablet completely dissolves. (Hint- This can be when you don't see the tablet anymore, or if the majority of the bubbling has stopped (i.e. the reaction finished). 4. Record the time in seconds in the data table.

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Data - Part 1

Today's Lab:

Time to Dissolve (s)

Investigation question: How does surface area affect the rate of a chemical reaction? We will do three trials of each condition and get the average for a represenatative value. (you can navigate to the trials by clicking them in the table) When you are done recording your data, continue to the data analysis section to see how we will work with our data.

Substance

Trial 1

Whole Tablet

Trial 2

Trial 3

Trial 1

Broken Tablet

Trial 2

Trial 3

Conditions:

Whole Tablet

Trial 1

Crushed Tablet

Broken Tablet

Trial 2

Crushed Tablet

Trial 3

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Data - Part 1

Data Analysis

Time to Dissolve (s)

For each of the conditions, we need a representative number (one number, not 3!) Get an average of the three trial times: (Trial 1 + Trial 2 + Trial 3) / 3 *Fill out this information on your lab report to be handed in.

Substance

Trial 1

Whole Tablet

Trial 2

Trial 3

Trial 1

Broken Tablet

Trial 2

Average Time to Dissolve (s)

Substance

Trial 3

Whole Tablet

Broken Tablet

Trial 1

Crushed Tablet

Crushed Tablet

Trial 2

Trial 3

Back to Data

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1. Start the timer when the water is added. 2. Time until tablet dissolves completely. (No more big bubbles / fizzing) 3. Record your data (time in seconds). 4. Continue to next trial.

Whole Tablet Trial 1

Return to procedure

Record Data

Next Trial

Whole Tablet Trial 2

Dont forget to record your data!

Return to procedure

Next Trial

Record Data

Whole Tablet Trial 3

Return to procedure

Record Data

Broken Tablet Trial 1

Return to procedure

Next Trial

Record Data

Broken Tablet Trial 2

Return to procedure

Next Trial

Record Data

Broken Tablet Trial 3

Return to procedure

Record Data

Crushed Tablet Trial 1

Return to procedure

Next Trial

Record Data

Crushed Tablet Trial 2

Return to procedure

Next Trial

Record Data

Crushed Tablet Trial 3

Record Data

Return to procedure

hi!